-- Id: 2379
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1856

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
function Init()
    indicator:name("Moving Average of Oscillator");
    indicator:description("Difference between the Moving Average Convergence/Divergence and the signal line.");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
 

    indicator.parameters:addGroup("Calculation");
	indicator.parameters:addString("Method", "MA Method", "Method" , "EMA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
   indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");
    indicator.parameters:addInteger("SN", "Short MA", "The period of the short MA", 12, 2, 1000);
    indicator.parameters:addInteger("LN", "Long MA", "The period of the Long MA", 26, 2, 1000);
    indicator.parameters:addInteger("IN", "Signal line", "The number of periods for the signal line.", 9, 2, 1000);
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("OsMAUP", "Color of UP OsMA", "Color of UP OsMA", core.rgb(0, 255, 0));
	indicator.parameters:addColor("OsMADOWN", "Color of DOWN OsMA", "Color of DOWN OsMA", core.rgb(255, 0, 0));
 	
   
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block
local SN;
local LN;
local IN;
 
local Method;
local firstPeriodMACD;

local firstPeriodSIGNAL;
local source = nil;

local EMAS = nil;
local EMAL = nil;
local MVAI = nil;

-- Streams block
local MACD = nil; 
local OsMA = nil;

-- Routine
 function Prepare(nameOnly) 
    
    Method = instance.parameters.Method;
    SN = instance.parameters.SN;
    LN = instance.parameters.LN;
    IN = instance.parameters.IN;
    source = instance.source;

    -- Check parameters
    if (LN <= SN) then
       error("The short EMA period must be smaller than long EMA period");
    end
	
	 -- Base name of the indicator.
    local name = profile:id() .. "(" .. source:name() .. ", " .. SN .. ", " .. LN .. ", " .. IN.. ", " .. Method .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	

    -- Create short and long EMAs for the source
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
    EMAS = core.indicators:create(Method, source, SN);
    EMAL = core.indicators:create(Method, source, LN);

   

    -- Create the output stream for the MACD. The first period is equal to the
    -- biggest first period of source EMA streams
    firstPeriodMACD = EMAL.DATA:first();
    MACD = instance:addInternalStream(0, 0);

    -- Create MVA for the MACD output stream.
    MVAI = core.indicators:create(Method, MACD, IN);

	
    firstPeriodSIGNAL = MVAI.DATA:first();
    SIGNAL=instance:addInternalStream(0, 0);
	
	 
	OsMA = instance:addStream("OsMA", core.Bar, name .. ".OsMA", "OsMA", instance.parameters.OsMAUP, firstPeriodSIGNAL);
    OsMA:setPrecision(math.max(2, instance.source:getPrecision()));
	 
end

-- Indicator calculation routine
function Update(period, mode)
    -- and update short and long EMAs for the source.
    EMAS:update(mode);
    EMAL:update(mode);

    if (period <firstPeriodMACD) then	
    return;
	end
	
         MACD[period] = EMAS.DATA[period] - EMAL.DATA[period];
 
  
    MVAI:update(mode);
    if (period < firstPeriodSIGNAL) then
	return;
	end
      
       
        OsMA[period] = MACD[period] -  MVAI.DATA[period];
		
		
		if not ONE then 
		
			if OsMA[period] > OsMA[period-1] then
			OsMA:setColor(period, instance.parameters.OsMAUP);
			 
			else
			OsMA:setColor(period, instance.parameters.OsMADOWN);
			 
			end
		end
  
end